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Which of the following is expected to be a paramagnetic complex?A. `[Ni(H_(2)O)_(6)]^(2+)`B. `[Ni(CO)_(4)]`C. `[Zn(NH_(3))_(4)]^(2+)`D. `[Co(NH_(3))_(6)]^(3+)`

Answer» Correct Answer - A
In `[Ni(H_(2)O)_(6)]^(2+)` configuration of `Ni^(2+) is [Ar^(18)] 3d^(8)` Hybridisation is `sp^(3)d^(2)` . There are two unpaired electrons and hence complex is paramagnetic.
For structure of `Ni(CO)_(4)` see Q . 44 above . It is diamagnetic.
In `[Zn(NH_(3))_(4)^(2+), Zn^(2+)` has cnfiguration of `[Ar^(18)]3d^(10)`. It is diamagnetic .
For structure of `[Co(NH_(3))_(6)]^(3+)`. See Q. 26 . It is diamagntic


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